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Ultra-low-dose CBCT scan: rational map for ear surgery.

Pekka Tamminen1,2,3,4, Jorma Järnstedt5, Antti Lehtinen5

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Tampere University Hospital, Elämänaukio 2, 33520, Tampere, Finland. pekka.tamminen@tuni.fi.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
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PubMed
Summary

Ultra-low-dose (ULD) cone-beam computed tomography (CBCT) provides clinically sufficient image quality for temporal bone imaging. This approach offers a safe alternative to high-resolution (HR) CBCT, especially for children and repetitive investigations.

Keywords:
Cone beam computed tomographyEar surgeryImage qualityTemporal boneUltra-low-dose protocol

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Area of Science:

  • Radiology
  • Medical Imaging
  • Otolaryngology

Background:

  • Cone-beam computed tomography (CBCT) is increasingly utilized for anatomical imaging.
  • Assessing the diagnostic quality of peripheral image data, particularly from the temporal bone, is crucial.
  • Optimizing radiation dose while maintaining clinical utility is a key consideration in medical imaging.

Purpose of the Study:

  • To evaluate the clinical quality and usability of peripheral temporal bone image data acquired with sinonasal ultra-low-dose (ULD) CBCT.
  • To compare the image quality of ULD CBCT with that of high-resolution (HR) CBCT for temporal bone imaging.

Main Methods:

  • Sixty-six anatomical sites (33 subjects' ears) were imaged using both HR CBCT and ULD CBCT modalities.
  • Image quality (IQ) for each anatomical site was assessed using a Likert scale (0-5).
  • The study compared image quality metrics between the two CBCT protocols.

Main Results:

  • ULD CBCT scans demonstrated clinically sufficient image quality in over 95% of images for the sigmoid sinus, jugular bulb, epitympanum, mastoid antrum, and external acoustic meatus.
  • IQ was clinically sufficient in 75-94% of ULD CBCT images for the scutum, mastoid segment of the facial nerve, cochlea, and semicircular canals.
  • Overall IQ of HR CBCT scans was rated as good or excellent.

Conclusions:

  • CBCT imaging, even with off-focus images, can achieve excellent structural resolution.
  • Ultra-low-dose CBCT yields clinically sufficient image quality for temporal bone imaging.
  • Ear surgeons are encouraged to consider lower radiation dose modalities, especially for children and frequent investigations.